Red Hat Enterprise Linux Server (v. 7 for x86_64) running in VMware
Unable to register Red Hat Enterprise Linux Server (v. 7 for x86_64) running in VMware wrokstation.

Responses
Prasanth,
There are two obvious issues. The first is that you have passed an invalid option, and the second is that the error is telling you that it can't reach subscription.rhn.redhat.com on port 443. Have you confirmed you have Internet connectivity from this VM?
You may also want to delete the screenshot if that is your username/password for the customer portal on line two.
Please check out this cheat sheet for usage of the subscription-manager command: Subscription-Manager Command Cheat Sheet for Red Hat Enterprise Linux
Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.
